k Piscium
| catalogues and names | k Psc, kap Psc, 8 Psc, HR 8911, HD 220825, SAO 128186, FK5: 884, WDS 23269+0115A |
| constellation | Pisces |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 23h 26min 56sec | DEC: +1° 15' 20'' |
| position (J1900) | RA: 23h 21min 48,3sec | DEC: +0° 42' 29'' |
| proper motion (J2000) | RA: 0,089 arcsec/a | DEC: -0,097 arcsec/a |
| radial velocity | -3 km/s note: variable radial velocity |
|
| rotational velocity | 41 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,04 arcsec | |
magnitude
| visual magnitude | 4,94 (V on UBV Johnson system) |
spectral / color information
| spectral class | A0pCrSi:Sr: |
| B-V-magnitude | 0,03 |
| U-B-magnitude | -0,02 |
| R-I-magnitude | -0,03 |
| note (category: spectra): | Oxygen deficient relative to magnesium. Many uranium lines; possibly the uncommon element holmium. Uranium and osmium may be due to supernova explosion in a nearby star. |
variability information
| variable star identification | Kap Psc |
| note (category: variability): | Alpha CV 4.91 - 4.96V, 0.58525:d. Period changes? Magnetic and spectrum variable, 0.5805d. |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 163,4 arcsec |
| mag difference (of double or brightest multiple) | 7 |
| component ID | AB |
| note | Worley (1978) update of the IDS |
| note (category: double and multiple data): | AB optical. Component A suspected occultation double. |
miscellaneous information
| note (category: group membership): | Member of Pleiades group. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 23h 26min 55,957sec | DEC: +1° 15' 20,07'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: 0,0059 arcsec/a | DEC: -0,097 arcsec/a | source: 25 | |
| radial velocity | -3 km/s | source: 25 | ||
| trigonometric parallax | 0,04 | ±0,004 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 83,93° | latitude: -55,08° | ||
| GCI unit vector (J2000) | X: 0,989372 | Y: -0,143749 | Z: 0,021912 | |
magnitude:
| visual | 4,9 (observed) | source: 31 |
| photovisual | 4,9 | source: 2 |
spectral information:
| spectral class | A2 | source: 96 | |
| Morgan-Keenan | A0pCrSi:Sr: | source: 25 | |
| B-magnitude | 4,97 ±0,05 | B-V-magnitude | 0,03 |
| U-magnitude | 4,95 ±0,05 | U-B-magnitude | -0,02 |
variability information:
| variability type | 160 |
| var. amplitude | 0,08 |
| var. period | 0,59 |
double/multiple star system information:
| separation between brightest and second brightest component | 163,4 arcsec |
| magnitude difference between brightest and second brightest component | 7 |
| position angle | 344 ° |
sources:
| 2 | HD and HDE Catalogs |
| Cannon, A.J., and E.C. Pickering, Harvard Annals, Vols 91-99, 1918-24, Cambridge, Massachusetts: Harvard University; Cannon, A.J., Harvard Annals, Vol. 100, 1925-36, Cambridge, Massachusetts: Harvard University; and Cannon, A.J., and M. Walton Mayall, Harvard Annals, Vol. 112, 1949, Cambridge, Massachusetts: Harvard University | |
| 15 | FK5, FK5 Extension and FK5 Supplement |
| Fricke, W., H. Schwan and T. Lederle, "Fifth Fundamental Catalogue (FK5), Part I. The Basic Fundamental Stars," Veroff. Astronomisches Recheninstitut, No. 32, Heidelberg, Germany, 1988, and Fricke, W., H. Schwan, and T.E. Corbin, "Fifth Fundamental Catalogue (FK5), Part II. The FK5 Extension," Veröff. Astronomisches Recheninstitut, No. 33, Heidelberg, Germany, 1991 | |
| 19 | WDS Catalog |
| Worley, C.E., and G.G. Douglass, Washington Catalog of Visual Double Stars 1996.0, United States Naval Observatory, 1996 | |
| 25 | Bright Star Catalogue, 5th edition |
| Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 1994 | |
| 30 | GCVS, 4th edition |
| Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88 | |
| 31 | CRM' (non-GCVS variable data) |
| Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 1994 | |
| 96 | SAO or HD/HDE Catalog |
| Reference from Value 1 or Reference from Value 2 | |
data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)
position and proper motion:
| position (J1950) | RA: 23h 24min 22,087sec | DEC: +0° 58' 53,91'' | ±0,004 arcsec |
| position (J2000) | RA: 23h 26min 55,954sec | DEC: +1° 15' 20,04'' | |
| proper motion J1950 (FK4) | RA: 0,0057 arcsec/a | DEC: -0,092 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0059 arcsec/a | DEC: -0,097 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4,9 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | A2p |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 884 |
| Durchmusterung | BD+00 4998 |
| Boss General Catalogue | 32620 |
| Henry Draper Catalogue | 220825 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 23h 26,9min | DEC: +1° 15' |
| proper motion (J2000) | RA: 0,089 arcsec/a | DEC: -0,097 arcsec/a |
double/multiple star system information:
| component | year | number of measures | position angle | angular separation | magnitude of 1st component | magnitude of 2nd component | spectral class(es) | discoverer code |
| AB | 1824 | 9 | 345° | 150,1'' | 4,94 | 11,9 | - | S 830 |
| 1921 | 344° | 163,4'' | ||||||
| BC | 1907 | 1 | 154° | 76,1'' | 11,9 | 13,1 | - | S 830 |
discoverer information:
| discoverer code | discoverer | reference |
| S 830 | South, J. | - |
notes:
| note | Kappa Psc. An optical pair. Spectrum A0pCrSi:Sr:. |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (J1950) | RA: 23h 24min 22,1sec | DEC: +0° 58' 54'' |
variability informations:
| variability type | ACV | rotating variable star |
| magnitute at max. brightness | 4,87 | |
| magnitute at min. brightness | 4,95 | |
| photometric system | visual, photovisual or Johnson's V | |
| period [d] | 0,58525 (uncertain) |
spectral information
| spectral class | A0p(Cr-Sr-Si-Eu) |
references
| to a study | Vol. III GCVS |
| to a chart/photograph | no chart is avaible, but the star is contained in the 'Bonner Durchmusterung' |
miscanellous
| ID in the GCVS catalogue | 66/9010 |
| constellation | Piscis Austrinus |
| notes on existence | The star is equivalent to '0670001 R'. |
variability type description
| variability type | description |
| ACV | Alpha2 Canum Venaticorum variables. These are main-sequence stars with spectral types B8p-A7p and displaying strong magnetic fields. Spectra show abnormally strong lines of Si, Sr, Cr, and rare earths whose intensities vary with rotation. They exhibit magnetic field and brightness changes (periods of 0.5-160 days or more). The amplitudes of the brightness changes are usually withine 0.01-0.1 mag in V. ACVO Rapidly oscillating Alpha2 CVn variables. These are nonradially pulsating, rotating magnetic variables of Ap spectral type (DO Eri). Pulsation periods are in the range of 6-12 mmag (0.004-0.01 days), while amplitudes of light variation caused by the pulsation are about 0.01 mag in V. The pulsational variations are superposed on those caused by rotation. |